What do countour lines that are uniformly spaced indicate?

Imagine that you own a property that is exactly 2.2 acres large. you want to sell your property, but your realtor tells you that you cannot sell your land by the acre. in order to sell your land you need to determine the area you own in units of square meters? given that there are 1.6 kilometers in 1 mile and 640 acres in 1 square mile, what is the area of land that you own in square meters square meters?

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

How many atoms are there in 5.70 mol of mg